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-rw-r--r--app/widgets/gimphistogramview.c823
1 files changed, 823 insertions, 0 deletions
diff --git a/app/widgets/gimphistogramview.c b/app/widgets/gimphistogramview.c
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+++ b/app/widgets/gimphistogramview.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "widgets-types.h"
+
+#include "core/gimphistogram.h"
+#include "core/gimpmarshal.h"
+
+#include "gimphistogramview.h"
+
+
+#define MIN_WIDTH 64
+#define MIN_HEIGHT 64
+
+enum
+{
+ RANGE_CHANGED,
+ LAST_SIGNAL
+};
+
+enum
+{
+ PROP_0,
+ PROP_CHANNEL,
+ PROP_SCALE,
+ PROP_BORDER_WIDTH,
+ PROP_SUBDIVISIONS
+};
+
+
+static void gimp_histogram_view_dispose (GObject *object);
+static void gimp_histogram_view_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_histogram_view_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_histogram_view_size_request (GtkWidget *widget,
+ GtkRequisition *requisition);
+static gboolean gimp_histogram_view_expose (GtkWidget *widget,
+ GdkEventExpose *event);
+static gboolean gimp_histogram_view_button_press (GtkWidget *widget,
+ GdkEventButton *bevent);
+static gboolean gimp_histogram_view_button_release (GtkWidget *widget,
+ GdkEventButton *bevent);
+static gboolean gimp_histogram_view_motion_notify (GtkWidget *widget,
+ GdkEventMotion *bevent);
+
+static void gimp_histogram_view_notify (GimpHistogram *histogram,
+ const GParamSpec *pspec,
+ GimpHistogramView *view);
+static void gimp_histogram_view_update_bins (GimpHistogramView *view);
+
+static void gimp_histogram_view_draw_spike (GimpHistogramView *view,
+ GimpHistogramChannel channel,
+ cairo_t *cr,
+ const GdkColor *fg_color,
+ cairo_operator_t fg_operator,
+ const GdkColor *bg_color,
+ gint x,
+ gint i,
+ gint j,
+ gdouble max,
+ gdouble bg_max,
+ gint height,
+ gint border);
+
+
+G_DEFINE_TYPE (GimpHistogramView, gimp_histogram_view,
+ GTK_TYPE_DRAWING_AREA)
+
+#define parent_class gimp_histogram_view_parent_class
+
+static guint histogram_view_signals[LAST_SIGNAL] = { 0 };
+
+
+static void
+gimp_histogram_view_class_init (GimpHistogramViewClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+ histogram_view_signals[RANGE_CHANGED] =
+ g_signal_new ("range-changed",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST,
+ G_STRUCT_OFFSET (GimpHistogramViewClass, range_changed),
+ NULL, NULL,
+ gimp_marshal_VOID__INT_INT,
+ G_TYPE_NONE, 2,
+ G_TYPE_INT,
+ G_TYPE_INT);
+
+ object_class->dispose = gimp_histogram_view_dispose;
+ object_class->get_property = gimp_histogram_view_get_property;
+ object_class->set_property = gimp_histogram_view_set_property;
+
+ widget_class->size_request = gimp_histogram_view_size_request;
+ widget_class->expose_event = gimp_histogram_view_expose;
+ widget_class->button_press_event = gimp_histogram_view_button_press;
+ widget_class->button_release_event = gimp_histogram_view_button_release;
+ widget_class->motion_notify_event = gimp_histogram_view_motion_notify;
+
+ klass->range_changed = NULL;
+
+ g_object_class_install_property (object_class, PROP_CHANNEL,
+ g_param_spec_enum ("histogram-channel",
+ NULL, NULL,
+ GIMP_TYPE_HISTOGRAM_CHANNEL,
+ GIMP_HISTOGRAM_VALUE,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_SCALE,
+ g_param_spec_enum ("histogram-scale",
+ NULL, NULL,
+ GIMP_TYPE_HISTOGRAM_SCALE,
+ GIMP_HISTOGRAM_SCALE_LINEAR,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_BORDER_WIDTH,
+ g_param_spec_int ("border-width", NULL, NULL,
+ 0, 32, 1,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_SUBDIVISIONS,
+ g_param_spec_int ("subdivisions",
+ NULL, NULL,
+ 1, 64, 5,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_histogram_view_init (GimpHistogramView *view)
+{
+ view->histogram = NULL;
+ view->bg_histogram = NULL;
+ view->n_bins = 256;
+ view->start = 0;
+ view->end = 255;
+}
+
+static void
+gimp_histogram_view_dispose (GObject *object)
+{
+ GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (object);
+
+ gimp_histogram_view_set_histogram (view, NULL);
+ gimp_histogram_view_set_background (view, NULL);
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_histogram_view_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (object);
+
+ switch (property_id)
+ {
+ case PROP_CHANNEL:
+ view->channel = g_value_get_enum (value);
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+ break;
+ case PROP_SCALE:
+ view->scale = g_value_get_enum (value);
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+ break;
+ case PROP_BORDER_WIDTH:
+ view->border_width = g_value_get_int (value);
+ gtk_widget_queue_resize (GTK_WIDGET (view));
+ break;
+ case PROP_SUBDIVISIONS:
+ view->subdivisions = g_value_get_int (value);
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_histogram_view_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (object);
+
+ switch (property_id)
+ {
+ case PROP_CHANNEL:
+ g_value_set_enum (value, view->channel);
+ break;
+ case PROP_SCALE:
+ g_value_set_enum (value, view->scale);
+ break;
+ case PROP_BORDER_WIDTH:
+ g_value_set_int (value, view->border_width);
+ break;
+ case PROP_SUBDIVISIONS:
+ g_value_set_int (value, view->subdivisions);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_histogram_view_size_request (GtkWidget *widget,
+ GtkRequisition *requisition)
+{
+ GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
+
+ requisition->width = MIN_WIDTH + 2 * view->border_width;
+ requisition->height = MIN_HEIGHT + 2 * view->border_width;
+}
+
+static gdouble
+gimp_histogram_view_get_maximum (GimpHistogramView *view,
+ GimpHistogram *histogram,
+ GimpHistogramChannel channel)
+{
+ gdouble max = gimp_histogram_get_maximum (histogram, channel);
+
+ switch (view->scale)
+ {
+ case GIMP_HISTOGRAM_SCALE_LINEAR:
+ break;
+
+ case GIMP_HISTOGRAM_SCALE_LOGARITHMIC:
+ if (max > 0.0)
+ max = log (max);
+ else
+ max = 1.0;
+ break;
+ }
+
+ return max;
+}
+
+static gboolean
+gimp_histogram_view_expose (GtkWidget *widget,
+ GdkEventExpose *event)
+{
+ GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
+ GtkStyle *style = gtk_widget_get_style (widget);
+ GtkAllocation allocation;
+ cairo_t *cr;
+ gint x;
+ gint x1, x2;
+ gint border;
+ gint width, height;
+ gdouble max = 0.0;
+ gdouble bg_max = 0.0;
+ gint xstop;
+ GdkColor *color_in;
+ GdkColor *color_out;
+ GdkColor *bg_color_in;
+ GdkColor *bg_color_out;
+ GdkColor rgb_color[3];
+
+ cr = gdk_cairo_create (gtk_widget_get_window (widget));
+
+ gdk_cairo_region (cr, event->region);
+ cairo_clip (cr);
+
+ /* Draw the background */
+ gdk_cairo_set_source_color (cr, &style->base[GTK_STATE_NORMAL]);
+ cairo_paint (cr);
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ border = view->border_width;
+ width = allocation.width - 2 * border;
+ height = allocation.height - 2 * border;
+
+ cairo_set_line_width (cr, 1.0);
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
+ cairo_translate (cr, 0.5, 0.5);
+
+ /* Draw the outer border */
+ gdk_cairo_set_source_color (cr, &style->text_aa[GTK_STATE_NORMAL]);
+ cairo_rectangle (cr, border, border,
+ width - 1, height - 1);
+ cairo_stroke (cr);
+
+ if (! view->histogram && ! view->bg_histogram)
+ {
+ cairo_destroy (cr);
+ return FALSE;
+ }
+
+ x1 = CLAMP (MIN (view->start, view->end), 0, view->n_bins - 1);
+ x2 = CLAMP (MAX (view->start, view->end), 0, view->n_bins - 1);
+
+ if (view->histogram)
+ max = gimp_histogram_view_get_maximum (view, view->histogram,
+ view->channel);
+
+ if (view->bg_histogram)
+ bg_max = gimp_histogram_view_get_maximum (view, view->bg_histogram,
+ view->channel);
+
+ color_in = &style->text[GTK_STATE_SELECTED];
+ color_out = &style->text[GTK_STATE_NORMAL];
+
+ bg_color_in = &style->mid[GTK_STATE_SELECTED];
+ bg_color_out = &style->mid[GTK_STATE_NORMAL];
+
+ if (view->channel == GIMP_HISTOGRAM_RGB)
+ {
+ for (x = 0; x < 3; x++)
+ {
+ rgb_color[x].red = (x == 0 ? 0xFFFF : 0x0);
+ rgb_color[x].green = (x == 1 ? 0xFFFF : 0x0);
+ rgb_color[x].blue = (x == 2 ? 0xFFFF : 0x0);
+ }
+ }
+
+ xstop = 1;
+ for (x = 0; x < width; x++)
+ {
+ gboolean in_selection = FALSE;
+
+ gint i = (x * view->n_bins) / width;
+ gint j = ((x + 1) * view->n_bins) / width;
+
+ if (! (x1 == 0 && x2 == (view->n_bins - 1)))
+ {
+ gint k = i;
+
+ do
+ in_selection |= (x1 <= k && k <= x2);
+ while (++k < j);
+ }
+
+ if (view->subdivisions > 1 && x >= (xstop * width / view->subdivisions))
+ {
+ gdk_cairo_set_source_color (cr, &style->text_aa[GTK_STATE_NORMAL]);
+
+ cairo_move_to (cr, x + border, border);
+ cairo_line_to (cr, x + border, border + height - 1);
+ cairo_stroke (cr);
+
+ xstop++;
+ }
+ else if (in_selection)
+ {
+ gdk_cairo_set_source_color (cr, &style->base[GTK_STATE_SELECTED]);
+
+ cairo_move_to (cr, x + border, border);
+ cairo_line_to (cr, x + border, border + height - 1);
+ cairo_stroke (cr);
+ }
+
+ if (view->channel == GIMP_HISTOGRAM_RGB)
+ {
+ gint c;
+
+ for (c = 0; c < 3; c++)
+ gimp_histogram_view_draw_spike (view, GIMP_HISTOGRAM_RED + c, cr,
+ &style->black,
+ CAIRO_OPERATOR_OVER,
+ NULL,
+ x, i, j, max, bg_max, height, border);
+
+ for (c = 0; c < 3; c++)
+ gimp_histogram_view_draw_spike (view, GIMP_HISTOGRAM_RED + c, cr,
+ &rgb_color[c],
+ CAIRO_OPERATOR_ADD,
+ NULL,
+ x, i, j, max, bg_max, height, border);
+
+ gimp_histogram_view_draw_spike (view, view->channel, cr,
+ in_selection ? color_in : color_out,
+ CAIRO_OPERATOR_OVER,
+ NULL,
+ x, i, j, max, bg_max, height, border);
+ }
+ else
+ {
+ gimp_histogram_view_draw_spike (view, view->channel, cr,
+ in_selection ? color_in : color_out,
+ CAIRO_OPERATOR_OVER,
+ in_selection ? bg_color_in : bg_color_out,
+ x, i, j, max, bg_max, height, border);
+ }
+ }
+
+ cairo_destroy (cr);
+
+ return FALSE;
+}
+
+static void
+gimp_histogram_view_draw_spike (GimpHistogramView *view,
+ GimpHistogramChannel channel,
+ cairo_t *cr,
+ const GdkColor *fg_color,
+ cairo_operator_t fg_operator,
+ const GdkColor *bg_color,
+ gint x,
+ gint i,
+ gint j,
+ gdouble max,
+ gdouble bg_max,
+ gint height,
+ gint border)
+{
+ gdouble value = 0.0;
+ gdouble bg_value = 0.0;
+ gint y;
+ gint bg_y;
+
+ if (view->histogram)
+ {
+ gint ii = i;
+
+ do
+ {
+ gdouble v = gimp_histogram_get_value (view->histogram,
+ channel, ii++);
+
+ if (v > value)
+ value = v;
+ }
+ while (ii < j);
+ }
+
+ if (bg_color && view->bg_histogram)
+ {
+ gint ii = i;
+
+ do
+ {
+ gdouble v = gimp_histogram_get_value (view->bg_histogram,
+ channel, ii++);
+
+ if (v > bg_value)
+ bg_value = v;
+ }
+ while (ii < j);
+ }
+
+ if (value <= 0.0 && bg_value <= 0.0)
+ return;
+
+ switch (view->scale)
+ {
+ case GIMP_HISTOGRAM_SCALE_LINEAR:
+ y = (gint) (((height - 2) * value) / max);
+ bg_y = (gint) (((height - 2) * bg_value) / bg_max);
+ break;
+
+ case GIMP_HISTOGRAM_SCALE_LOGARITHMIC:
+ y = (gint) (((height - 2) * log (value)) / max);
+ bg_y = (gint) (((height - 2) * log (bg_value)) / bg_max);
+ break;
+
+ default:
+ y = 0;
+ bg_y = 0;
+ break;
+ }
+
+ if (bg_color)
+ {
+ gdk_cairo_set_source_color (cr, bg_color);
+
+ cairo_move_to (cr, x + border, height + border - 1);
+ cairo_line_to (cr, x + border, height + border - bg_y - 1);
+
+ cairo_stroke (cr);
+ }
+
+ cairo_set_operator (cr, fg_operator);
+
+ gdk_cairo_set_source_color (cr, fg_color);
+
+ cairo_move_to (cr, x + border, height + border - 1);
+ cairo_line_to (cr, x + border, height + border - y - 1);
+
+ cairo_stroke (cr);
+
+ cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+}
+
+static gboolean
+gimp_histogram_view_button_press (GtkWidget *widget,
+ GdkEventButton *bevent)
+{
+ GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
+
+ if (bevent->type == GDK_BUTTON_PRESS && bevent->button == 1)
+ {
+ GtkAllocation allocation;
+ gint width;
+
+ gtk_grab_add (widget);
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ width = allocation.width - 2 * view->border_width;
+
+ view->start = CLAMP (((bevent->x - view->border_width) * view->n_bins) / width,
+ 0, view->n_bins - 1);
+ view->end = view->start;
+
+ gtk_widget_queue_draw (widget);
+ }
+
+ return TRUE;
+}
+
+static gboolean
+gimp_histogram_view_button_release (GtkWidget *widget,
+ GdkEventButton *bevent)
+{
+ GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
+
+ if (bevent->button == 1)
+ {
+ gint start, end;
+
+ gtk_grab_remove (widget);
+
+ start = view->start;
+ end = view->end;
+
+ view->start = MIN (start, end);
+ view->end = MAX (start, end);
+
+ g_signal_emit (view, histogram_view_signals[RANGE_CHANGED], 0,
+ view->start, view->end);
+ }
+
+ return TRUE;
+}
+
+static gboolean
+gimp_histogram_view_motion_notify (GtkWidget *widget,
+ GdkEventMotion *mevent)
+{
+ GimpHistogramView *view = GIMP_HISTOGRAM_VIEW (widget);
+ GtkAllocation allocation;
+ gint width;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ width = allocation.width - 2 * view->border_width;
+
+ view->start = CLAMP (((mevent->x - view->border_width) * view->n_bins) / width,
+ 0, view->n_bins - 1);
+
+ gtk_widget_queue_draw (widget);
+
+ return TRUE;
+}
+
+
+/* public functions */
+
+GtkWidget *
+gimp_histogram_view_new (gboolean range)
+{
+ GtkWidget *view = g_object_new (GIMP_TYPE_HISTOGRAM_VIEW, NULL);
+
+ if (range)
+ gtk_widget_add_events (view,
+ GDK_BUTTON_PRESS_MASK |
+ GDK_BUTTON_RELEASE_MASK |
+ GDK_BUTTON1_MOTION_MASK);
+
+ return view;
+}
+
+void
+gimp_histogram_view_set_histogram (GimpHistogramView *view,
+ GimpHistogram *histogram)
+{
+ g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
+#if 0
+ g_return_if_fail (histogram == NULL ||
+ view->bg_histogram == NULL ||
+ gimp_histogram_n_components (view->bg_histogram) ==
+ gimp_histogram_n_components (histogram));
+#endif
+
+ if (view->histogram != histogram)
+ {
+ if (view->histogram)
+ {
+ g_signal_handlers_disconnect_by_func (view->histogram,
+ gimp_histogram_view_notify,
+ view);
+ g_object_unref (view->histogram);
+ }
+
+ view->histogram = histogram;
+
+ if (histogram)
+ {
+ g_object_ref (histogram);
+
+ g_signal_connect (histogram, "notify",
+ G_CALLBACK (gimp_histogram_view_notify),
+ view);
+
+ if (! gimp_histogram_has_channel (histogram, view->channel))
+ gimp_histogram_view_set_channel (view, GIMP_HISTOGRAM_VALUE);
+ }
+
+ gimp_histogram_view_update_bins (view);
+ }
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+GimpHistogram *
+gimp_histogram_view_get_histogram (GimpHistogramView *view)
+{
+ g_return_val_if_fail (GIMP_IS_HISTOGRAM_VIEW (view), NULL);
+
+ return view->histogram;
+}
+
+void
+gimp_histogram_view_set_background (GimpHistogramView *view,
+ GimpHistogram *histogram)
+{
+ g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
+#if 0
+ g_return_if_fail (histogram == NULL ||
+ view->histogram == NULL ||
+ gimp_histogram_n_components (view->histogram) ==
+ gimp_histogram_n_components (histogram));
+#endif
+
+ if (view->bg_histogram != histogram)
+ {
+ if (view->bg_histogram)
+ {
+ g_signal_handlers_disconnect_by_func (view->bg_histogram,
+ gimp_histogram_view_notify,
+ view);
+ g_object_unref (view->bg_histogram);
+ }
+
+ view->bg_histogram = histogram;
+
+ if (histogram)
+ {
+ g_object_ref (histogram);
+
+ g_signal_connect (histogram, "notify",
+ G_CALLBACK (gimp_histogram_view_notify),
+ view);
+
+ if (! gimp_histogram_has_channel (histogram, view->channel))
+ gimp_histogram_view_set_channel (view, GIMP_HISTOGRAM_VALUE);
+ }
+
+ gimp_histogram_view_update_bins (view);
+ }
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+}
+
+GimpHistogram *
+gimp_histogram_view_get_background (GimpHistogramView *view)
+{
+ g_return_val_if_fail (GIMP_IS_HISTOGRAM_VIEW (view), NULL);
+
+ return view->bg_histogram;
+}
+
+void
+gimp_histogram_view_set_channel (GimpHistogramView *view,
+ GimpHistogramChannel channel)
+{
+ g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
+
+ if (channel != view->channel)
+ g_object_set (view, "histogram-channel", channel, NULL);
+}
+
+GimpHistogramChannel
+gimp_histogram_view_get_channel (GimpHistogramView *view)
+{
+ g_return_val_if_fail (GIMP_IS_HISTOGRAM_VIEW (view), 0);
+
+ return view->channel;
+}
+
+void
+gimp_histogram_view_set_scale (GimpHistogramView *view,
+ GimpHistogramScale scale)
+{
+ g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
+
+ if (scale != view->scale)
+ g_object_set (view, "histogram-scale", scale, NULL);
+}
+
+GimpHistogramScale
+gimp_histogram_view_get_scale (GimpHistogramView *view)
+{
+ g_return_val_if_fail (GIMP_IS_HISTOGRAM_VIEW (view), 0);
+
+ return view->scale;
+}
+
+void
+gimp_histogram_view_set_range (GimpHistogramView *view,
+ gint start,
+ gint end)
+{
+ g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
+
+ if (view->start != MIN (start, end) ||
+ view->end != MAX (start, end))
+ {
+ view->start = MIN (start, end);
+ view->end = MAX (start, end);
+
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+
+ g_signal_emit (view, histogram_view_signals[RANGE_CHANGED], 0,
+ view->start, view->end);
+ }
+}
+
+void
+gimp_histogram_view_get_range (GimpHistogramView *view,
+ gint *start,
+ gint *end)
+{
+ g_return_if_fail (GIMP_IS_HISTOGRAM_VIEW (view));
+
+ if (start) *start = view->start;
+ if (end) *end = view->end;
+}
+
+
+/* private functions */
+
+static void
+gimp_histogram_view_notify (GimpHistogram *histogram,
+ const GParamSpec *pspec,
+ GimpHistogramView *view)
+{
+ if (! strcmp (pspec->name, "n-bins"))
+ {
+ gimp_histogram_view_update_bins (view);
+ }
+ else
+ {
+ gtk_widget_queue_draw (GTK_WIDGET (view));
+ }
+}
+
+static void
+gimp_histogram_view_update_bins (GimpHistogramView *view)
+{
+ gint new_bins = 0;
+
+ if (view->histogram)
+ new_bins = gimp_histogram_n_bins (view->histogram);
+ else if (view->bg_histogram)
+ new_bins = gimp_histogram_n_bins (view->bg_histogram);
+
+ if (new_bins > 0 && new_bins != view->n_bins)
+ {
+ view->start = MIN (ROUND ((gdouble) view->start *
+ new_bins / view->n_bins),
+ new_bins - 1);
+ view->end = MAX (ROUND ((gdouble) (view->end + 1) *
+ new_bins / view->n_bins) - 1,
+ 0);
+
+ view->n_bins = new_bins;
+
+ g_signal_emit (view, histogram_view_signals[RANGE_CHANGED], 0,
+ view->start, view->end);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-14 11:05:09 +0000